Transitional background for a portion of a display screen



FIG. 1 is a front view of the first image in the sequence for a transitional background for a portion of a display screen showing the new design;

FIG. 2 is a front view of the second image thereof;

FIG. 3 is a front view of the third image thereof;

FIG. 4 is a front view of the fourth image thereof;

FIG. 5 is a front view of the fifth image thereof;

FIG. 6 is a front view of the sixth image thereof; and,

FIG. 7 is a front view of the seventh image thereof.

The appearance of the transitional image sequentially transitions between the images shown in FIGS. 1–7. The process or period in which one image transitions to another forms no part of the claimed design. The broken line showing the display screen is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a transitional background for a portion of a display screen, as shown and described. 